Vanettes have the build plate under the right front seat beat on the B pillar if they are A series, & under the right front seat if Z powered (there's a little flap in the carpet/vinyl. This will tell you the ratio the van should have. the A12 Vanette had a 4.89:1 H165. The A15 van had either a steel 4.11:1 H190 or an Aluminium 4.625:1 H190 with axles the same size as the H165. The Z series vanettes had 4.11:1 H190s for manuals or 4.375:1 H190s with the large axles. Front diffs from a 4wd ******* (can't thing of their name but they're shaped like a Toyotya 4runner) are 4.625:1 & I have found some 4.89:1 diffs in larger vans.